Returns []byte so callers can zeroize the buffer after use.
Refactors internals to share readRaw between both variants.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Provides echo-suppressed password prompting via golang.org/x/term for
CLI login commands. Added as a platform standard in engineering-standards.md.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
